Performance improvement of ultrasonic range super-resolution based on phase rotation by dealing with echo distortion

Nguyen, Chi-Hai; Zhu, Jing; Tagawa, Norio; Yoshizawa, Masasumi; Irie, Takasuke

doi:10.1121/2.0001158

Cited by 4 publications

(2 citation statements)

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“…In addition, although the filtered-FPWC-MVDR method was constructed in the time domain in this paper, efficiency consideration are currently driving reconstruction of this method in the frequency domain with reference to the method in the literature. 14) Previously, we have studied methods to detect the positions of a small number of reflectors with high resolution [24][25][26][27][28] and these methods were suitable for use in anomaly detection applications such as tumor imaging. The technical feature of these methods involved realizing the required resolution at the wavelength level of the carrier by using various frequencies for both transmission and reception.…”

Section: Discussionmentioning

confidence: 99%

Plane wave beamforming with adaptively weighted frequency compound using bandpass filtering

Zheng

Tagawa

Yoshizawa

et al. 2021

Jpn. J. Appl. Phys.

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We previously proposed the frequency and plane-wave compounding minimum variance distortion-free response (FPWC-MVDR) beamformer for ultrasonic reception beamforming, which weights the transmission angle and frequency band adaptively. This method required multiple subband transmissions and receptions for each transmission angle, reducing the frame rate. Here, we propose a filtered-FPWC-MVDR method that extracts and uses subband components via signal processing from the echo received after a single wideband pulse transmission. After confirming that this method provides the same performance as the original FPWC-MVDR, we experimentally investigate the subband conditions required, i.e. the bandwidth and number of subbands, when using this method. As a result, to improve the point target resolution, we find that there is an appropriate subbandwidth condition involving a trade-off between ensuring echo localization and increasing the degrees of freedom for frequency weight determination. Additionally, for improved contrast, the subbands were arranged appropriately to cover the entire usable frequency band.

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Section: Discussionmentioning

confidence: 99%

Plane wave beamforming with adaptively weighted frequency compound using bandpass filtering

Zheng

Tagawa

Yoshizawa

et al. 2021

Jpn. J. Appl. Phys.

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“…4,5) With the higher frequencies that are transmitted and received, a problem arises in designing the ultrasound equipment because they also become very complicated. [6][7][8] Early ultrasound imaging techniques are based on the linear theory of acoustics. This proves troublesome when increasing the frequency to improve imaging.…”

Section: Introductionmentioning

confidence: 99%

Subband compound with fundamental wave and harmonics in focus wave beamforming

Zheng¹,

憲男²,

Yoshizawa³

et al. 2022

Jpn. J. Appl. Phys.

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The use of harmonics offers high resolution and low artifact imaging. However, the image intensity depends on the depth of field and is significantly weaker than the fundamental echo. The simultaneous use with the fundamental echo is therefore desirable. However, the frequency bands corresponding to the fundamental and harmonics are different, and the difference in value between their amplitudes is large. Imaging them simultaneously is difficult. Therefore, we propose a method that employs a single short-period transmission of a low-frequency pulse signal so that the fundamental and the harmonic meet. Then we use the subband compound method which treats the fundamental and harmonic bands as a single frequency band. Several regularized subbands of different frequencies are subsequently extracted from the entire frequency band. In effect, this method uses the phase information of the frequency band and improves the spatial resolution and signal-to-noise ratio through sub-band amplitude modulation while suppressing artifacts.

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Optimization of Frequency and Plane- Wave Compounding by Minimum Variance Beamforming

Kozai

Tagawa

Yoshizawa

et al. 2020

2020 IEEE International Ultrasonics Symposium (IUS)

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Performance improvement of ultrasonic range super-resolution based on phase rotation by dealing with echo distortion

Cited by 4 publications

References 0 publications

Plane wave beamforming with adaptively weighted frequency compound using bandpass filtering

Plane wave beamforming with adaptively weighted frequency compound using bandpass filtering

Subband compound with fundamental wave and harmonics in focus wave beamforming

Optimization of Frequency and Plane- Wave Compounding by Minimum Variance Beamforming

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